Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

MasTec, Inc.

Coral Gables, Florida

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 No. 333-235597 and Form S-8 (Nos. 333-139996, 333-112010, 333-105781, 333-105516, 333-38932, 333-77823, 333-47003, 333-38940, 333-30647, 333-174922, 333-188974, 333-209061, 333-64568, 033-55327 and 333-22465) of MasTec, Inc. of our reports dated February 27, 2020 relating to the consolidated financial statements and financial statement schedule, and the effectiveness of MasTec, Inc.’s internal control over financial reporting which appear in this Form 10-K.

/s/ BDO USA, LLP    

Miami, Florida

February 27, 2020